What do you think of the philosophy of "we'll get enough sleep when we are dead"?

My mom always has to be doing something even if she gets no sleep for 2 or 3 days at a time. Whenever I try to talk to her about slowing down she'll say that phrase. To me keeping going like that is not good for mental health.
What do you think of the philosophy of "we'll get enough sleep when we are dead"?
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